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Leptonic Meson Decays into Invisible ALP
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abstract
The theoretical calculation of pseudo-scalar leptonic decay widths into an invisible ALP, $M \to \ell\, \nu_\ell\, a$, is reviewed. Assuming generic flavour-conserving ALP couplings to SM fermions and a generic ALP mass, $m_a$, the latest experimental results for pseudo-scalar leptonic decays are used to provide updated bounds on the ALP-fermion Lagrangian sector. Constrains on the ALP-quark couplings obtained from these channels are not yet competitive with the ones derived from FCNC processes, like $M\to P\,a$ decays. These leptonic decays can, however, provide the most stringent model-independent upper bounds on ALP-leptons couplings for $m_a$ in the (sub)-GeV range.
Forward citations
Cited by 3 Pith papers
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Constraints on axion-like particles using lattice QCD calculations of the rate for $J/\psi \to \gamma a$
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Seesaw Majoron models imply parameter-free correlations among Higgs, muon decay, and neutrino observables that can identify the neutrino mass mechanism.
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